Hello, just want to request this item bonus. It's called LifeSteal, I think there's a similar one already in, but I wanted it to be like this.
LifeSteal, every hit will have a stolen percent (%) of the total HP of the enemy.
bonus bLifeSteal, n%;
maybe also another parameter with cooldown of seconds that will trigger the effect.
bonus bLifeSteal, n%, x;
Thank you! Actually it wouldn't be that hard to do, but I honestly don't know where these bonuses are. I think battle.c though.

It really depends on the skill and which Job is using it. For example, you can use the Vulcan+Song+Change Guitar combo with clown and it will work if the delays are setted properly, but with minstrel, as far as I'm concerned, it does not work quite properly. From what I know it has something to do with the Sprites, the delay works differently even if the delay is set to 0.
As if you just want to set the delay of any skill to 0 (even though it may not cast as fast as you want it to be, because of the issue I mentioned above), just do as JaBote said above+

It's amazing how many people has contributed to Athena/RO Emu Community. Brings back memories, since I started back in late 2006, even though I haven't do much lately, it was a pleasure working with pretty much most of them, and being able to learn and get experience from everyone.
*Cheers*

hercules/conf/groups.conf
https://github.com/HerculesWS/Hercules/blob/master/conf/groups.conf
Depending on the group you want to add it for...
id: 0 /* group 0 is the default group for every new account */ name: "Player" level: 0 inherit: ( /*empty list*/ ) commands: { /* no commands by default */ //the commands must be added here }
To add a command the format is:
commands: [true, false]
being the first value @ and the second #
commandname: [@,#]
true to enable the command
false to disable the command
You may have posted on the wrong section though (Moved to General Support).